Apparatus for making paper-stock



(No Model.)

J. D. TOMPK'INS.

APPARATUS FOR MAKING PAPER STOCK.

No. 480,595. Patented June 17, 1890.

w/mmsm; Ill/VENTO/R 49: JW 7 KM; 3 2,441 BY ATTORNEY UNITED STATES PATENT OFFICE.

JOHN D. TOMPKINS, OF NASSAU, NE\V YORK.

APPARATUS FOR MAKING PAPER-STOCK.

SPECIFICATION forming part of Letters Patent No. 430,595, dated June 17, 1890.

Application filed November 15, 1888. Serial No. 290,945. (No model.)

To all whom it may concern:

Be it known that I, JOHN D. TOMPKINs, of Nassau, in the county of Rensselaer, State of New York, have invented certain new and useful Improvements in Apparatus for Making Paper-Stock, of which the following is a specification. I

My invention relates to an improved means of circulating the treating-liquors commonly employed in the manufacture of paper-stock through the material in the digestion-vessel, whereby the manufacture may be facilitated and a better article produced.

The accompanying drawing shows a section of such a digester as I prefer to use, and also shows the various pipes, pumps, &c., whereby the treating-liquid is circulated within the digester.

Referring to the drawing, A represents the casing or shell, preferably made of boilerplate and of any convenient shape or size. The interior of the shell may be lined with any acid-resisting material which will not be affected by the action of any of the chemical liquids used in the digester. Central within the shell is the digesting-chamber A, and at each end are the chambers C O, separated from the digesting-chamber by perforated walls or diaphragms B B. In the top of the digester is a man-hole D, provided with a closing-plate (1, through which the material to be treated may be introduced into the digesting-chamber. In the bottom of the shell and connected with the digesting-chamber is a discharge-pipe E, provided with a valve e, through which the treated material may be drawn from the digesting-chamber.

The chambers O and O are connected together through the pipes F F, in the lower part of one of which is interposed a pump G, adapted to deliver the liquid therefrom into the chamber 0. Connected to the pipe F is a small pipe F which is also connected to the chamber C and connected to the eduction-pipe F and the pump is apipe F which is connected with the upper chamber C. Normally the pump G draws its supply of liquid from the upper chamber 0 by the pipe 1?,delivering it into the lower chamber 0 by pipe F; but by closing valve 2 in pipe F and valve 1" in pipe F and opening valve 2' in pipe I and valve t in pipe 13 the pump will draw its supply of liquid from the lower chamber 0 and deliver it into the upper chamber C. The object of this arrangement will hereinafter be more fully described.

The pipe F is the pipe through which the treating-liquids are introduced into the digester and normally caused to circulate therein. The treating-liquids while not in use are, as a rule, stored in tanks (not shown) contiguous to the digester, and these tanks I connect to the pipe F through the pipes II I J K, provided with the valves h. A single fiexible pipe, however, will serve the purpose of all of these pipes, as it may be united to several tanks in succession and as required.

0 represents a pipe connected to any suitable source of steam, which pipe is connected through the branch pipes O O to the chambers O and 0'. Suitable valves 01 are included in these pipes.

A waste-steam pipe 11 connects the upper chamber 0 with any suitable Water-tank or other device for collecting the condensed wa ter from the steam. A similar pipe Q connects the upper chamber C with any suitable tank within which the bleaching-gases may be stored.

L is a waste-valve leading from the lower chamber 0, through which the treating-liquids may be drawn away.

T is a tester of the usual form connected to the side of the digesting-chamber, and V an air-valve in the top of the chamber'O.

The material to be treated is introduced through the man-hole D. At the same time the pump G is started, drawing the preliminary treating-liquid from the tank within which it is stored through the pipe II and delivering it into the chamber C, and from thence in an upward direction through the perforations of the diaphragm, the sum of the areas of which is made, preferably, somewhat less than the area of the inlet-pipe, so as to impart a certain velocity to the upwardly-directed streams of liquid transmitted through the perforations. The upwardly-directed streams are projected against the material as it is introduced into the digestingchamber, so as in effect to effectually spray the material from below as it falls into the chamber. NVhen sufficient quantity of material and liquid has been introduced into the digesting-chamber, the valve in the pipe His closed and the pump G draws the liquid from the upper chamber 0 and introduces it into the lower chamber, from whence it is sprayed upward against the mass of material in the digester, which, becoming soaked, tends to gravitate. The eifect of the upwardly-directed streams of liquid impelled from the pump through the diaphragm is to overcome the gravity of the particles of material within the digesting-chamber and to hold them, so to speak, in suspension in the treating-liquid.

It is my purpose in treating the material in the digesting-chamber to keep the material in suspension in the treating-liquid, and hence the direction of flow or circulation of the treating-liquid is always from below upward. WVhen treating certain classes of paper-stock material it is occasionally found that the light feathery portions tend to be carried upward and to lodge against the digester-surface of the diaphragm B. As the diaphragm becomes covered with this material the circulation is of course impeded, and in order to overcome this difficulty I have arranged the pump G and the various communicating pipes so that the direct-ion of circu lation of the liquid within the digester may be reversed and the liquid drawn from the lower chamber 0' and delivered into the upper chamber 0, and from thence through the diaphragm B in a downward direction upon the material Within the digesting-chamber.

The effect of the reversal in the circulation is to cleanse the diaphragm B from any ad-' the diaphragml I claim as my invention 1. In an apparatus for making paper-stock, the combination of a central digesting-chamber, an upper and lower fluid-chamber communicating therewith, the pipes F and F a pump interposed between said pipes, the pipes F and F and the valves of the respect- We pipes, whereby the liquid circulation may be reversed, substantially as and in the manner described.

2. In an apparatus for making paper-stock, the combination, with thebody of the digesting-vessel, of the pipes F and F a pump interposed between said pipes, the pipes F and F and the valves of the respective pipes, whereby the liquid circulation may be reversed, substantially as described.

In Witness whereof I have hereunto set my hand this 1st day of November, 1888.

JOHN D. TOMPKINS. Witnesses:

G. WV. GoERTUN, OHAs. E. GANTZ. 

